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Java > Open Source Codes > org > jfree > xml > factory > objects > DateObjectDescription


1 /* ========================================================================
2  * JCommon : a free general purpose class library for the Java(tm) platform
3  * ========================================================================
4  *
5  * (C) Copyright 2000-2005, by Object Refinery Limited and Contributors.
6  *
7  * Project Info: http://www.jfree.org/jcommon/index.html
8  *
9  * This library is free software; you can redistribute it and/or modify it
10  * under the terms of the GNU Lesser General Public License as published by
11  * the Free Software Foundation; either version 2.1 of the License, or
12  * (at your option) any later version.
13  *
14  * This library is distributed in the hope that it will be useful, but
15  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
16  * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
17  * License for more details.
18  *
19  * You should have received a copy of the GNU Lesser General Public
20  * License along with this library; if not, write to the Free Software
21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
22  * USA.
23  *
24  * [Java is a trademark or registered trademark of Sun Microsystems, Inc.
25  * in the United States and other countries.]
26  *
27  * --------------------------
28  * DateObjectDescription.java
29  * --------------------------
30  * (C)opyright 2003, 2004, by Thomas Morgner and Contributors.
31  *
32  * Original Author: Thomas Morgner;
33  * Contributor(s): David Gilbert (for Object Refinery Limited);
34  *
35  * $Id: DateObjectDescription.java,v 1.4 2005/11/14 11:01:31 mungady Exp $
36  *
37  * Changes (from 19-Feb-2003)
38  * -------------------------
39  * 19-Feb-2003 : Added standard header and Javadocs (DG);
40  * 29-Apr-2003 : Distilled from the JFreeReport project and moved into JCommon
41  *
42  */

43
44 package org.jfree.xml.factory.objects;
45
46 import java.util.Calendar JavaDoc;
47 import java.util.Date JavaDoc;
48 import java.util.GregorianCalendar JavaDoc;
49
50 /**
51  * An object-description for a <code>Date</code> object.
52  *
53  * @author Thomas Morgner
54  */

55 public class DateObjectDescription extends AbstractObjectDescription {
56
57     /**
58      * Creates a new object description.
59      */

60     public DateObjectDescription() {
61         super(Date JavaDoc.class);
62         setParameterDefinition("year", Integer JavaDoc.class);
63         setParameterDefinition("month", Integer JavaDoc.class);
64         setParameterDefinition("day", Integer JavaDoc.class);
65     }
66
67     /**
68      * Creates an object based on this description.
69      *
70      * @return The object.
71      */

72     public Object JavaDoc createObject() {
73         final int y = getIntParameter("year");
74         final int m = getIntParameter("month");
75         final int d = getIntParameter("day");
76
77         return new GregorianCalendar JavaDoc(y, m, d).getTime();
78     }
79
80     /**
81      * Returns a parameter value as an <code>int</code>.
82      *
83      * @param param the parameter name.
84      *
85      * @return The parameter value.
86      */

87     private int getIntParameter(final String JavaDoc param) {
88         final Integer JavaDoc p = (Integer JavaDoc) getParameter(param);
89         if (p == null) {
90             return 0;
91         }
92         return p.intValue();
93     }
94
95     /**
96      * Sets the parameters of this description object to match the supplied object.
97      *
98      * @param o the object (should be an instance of <code>Date</code>).
99      *
100      * @throws ObjectFactoryException if the object is not an instance of <code>Date</code>.
101      */

102     public void setParameterFromObject(final Object JavaDoc o) throws ObjectFactoryException {
103         if (o instanceof Date JavaDoc) {
104             final GregorianCalendar JavaDoc gc = new GregorianCalendar JavaDoc();
105             gc.setTime((Date JavaDoc) o);
106             final int year = gc.get(Calendar.YEAR);
107             final int month = gc.get(Calendar.MONTH);
108             final int day = gc.get(Calendar.DAY_OF_MONTH);
109
110             setParameter("year", new Integer JavaDoc(year));
111             setParameter("month", new Integer JavaDoc(month));
112             setParameter("day", new Integer JavaDoc(day));
113         }
114         else {
115             throw new ObjectFactoryException("Is no instance of java.util.Date");
116         }
117
118     }
119 }
120
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